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do you know what ide channel that cd is on? hdb or hdc, etc.
hdparm -d0 /dev/hdX
where X is b, c, d, etc...
also check if you enable dma in any scripts on start up or what not and delete that line if there is. for redhat, a common place to enable dma manually is /etc/rc.d/rc.local. and maybe post your grub.conf file.
i can now mount cd's on my faster drive without fearing a freeze. thanX
ThanKs for the Help
no problem. but are you sure dma is enabled? is it always enabled? do you know where it's enabled at? if i remember correctly hdparm settings aren't sticky. at least for me, hdparm dma wasn't on by default for my peripherals. i guess what i'm saying is to make sure you didn't manually set dma for that drive in one of your start up scripts.